Make Dockerfile a programming language (#4169)
Make Dockerfile a programming language (#4169)

* Make Dockerfile a programming language

* Add Docker colour

github/linguist,erkyrath/linguist,pchaigno/linguist,sebgod/linguist,christop/linguist,sebgod/linguist,erkyrath/linguist,pchaigno/linguist,erkyrath/linguist,github/linguist,christop/linguist,erkyrath/linguist,github/linguist,sebgod/linguist,github/linguist,pchaigno/linguist,pchaigno/linguist,sebgod/linguist